C++ Auto Register

AutoRegister.cpp

#include <iostream>

//int a = 0;

template <typename T, T /*unnamed*/>
struct nnb_ForceInit { };

template<
    class T
>
class Scriptable {
public:
    struct nnb_Proxy {
        nnb_Proxy() {
            std::cout << "Proxy was executed! ID: " << T::id() << std::endl;
            //a++;
        }
    };

    static nnb_Proxy __nnb_proxy__;
    typedef nnb_ForceInit<nnb_Proxy&, __nnb_proxy__> __nnb_typedef_dummy__;
} ;

template<
    class T
>
typename Scriptable<T>::nnb_Proxy Scriptable<T>::__nnb_proxy__;

class Object : public Scriptable<Object> {
public:
    static const char* id() {
        return "[Object]";
    }
};

class Image : public Scriptable<Image> {
public:
    static const char* id() {
        return "[Image]";
    }
};

class Error : public Scriptable<Error> {
public:
    static const char* id() {
        return "[Error]";
    }
} ;

int main() {
    std::cout << "Done " << std::endl;
}